Dreaded service brake system message

Discussion in 'Engine & Drivetrain' started by Erickk120, Aug 2, 2018.

  1. Erickk120

    Erickk120 Member

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    I recently replaced my entire suspension, kept the old hub bearings since those have around 50k miles. now brake related I replaced an old cracked line in the driver side and readjusted the pistons back to their resting place to service the guide pins and lube the hardware brake pads are also in good shape. When set and done I bled that caliper turned the vehicle on and bled again with it on for some reason, and after that, I turned the truck back on and boom, the dreaded service brake system message with the annoying chiming kicked in. I filled the master cylinder full again to no avail. Should I just bleed all 4 corners and see if it goes away or did I get into more than what I was bargaining for? Tried to look for info around but can't seem to find definitive answers, Note I don't have the ABS light on its just the parking red one with the message and chiming, any advice is appreciated as this is driving me nuts. Thanks in advance :)

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  2. Tonyrodz

    Tonyrodz Full Access Member

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    If it was me I'd bleed all 4 corners again, even twice to make sure, and check for any leaks, especially near or on the calipers.
     
  3. CountryBoy19

    CountryBoy19 Full Access Member

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    So you replaced the line THEN compressed the caliper pistons back before bleeding?

    If you didn't bleed right after replacing the line you had air in the system from replacing the line. Then you pushed the air back toward the metering valve, ABS module, and Master-cylinder which means that air, when pushed back toward the brakes again could have gone toward any wheel. I would try bleeding all 4 wheels.
     
  4. Doubeleive

    Doubeleive Elite Member Supporting Member

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    I had the same problem recently, proportioning valve was stuck, I was going to have it bled to correct it but it fixed its self. if you have that warning and no abs light then it may be the proportioning valve or the brake fluid level sensor, on my 03 Silverado the sensor is right on the valve but yours may be on or under the fluid reservoir, you can try unplugging it and see if the message goes away just as a diagnostic check, a tech2 will indicate it as "low pressure" and it may not even have a DTC

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  5. SnowDrifter

    SnowDrifter Full Access Member

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    Little not while bleeding these: Air will get trapped in the ABS system. It needs to be cycled to fully purge the air. You can use either a tech 2, or a similar high end scanner. or you'll need to bleed it, then go out and do some hard stops to cycle the ABS, bleed again, etc until you're not getting any more. You'll go through 3-4 quarts of brake fluid doing this. 1 for the reservoir, 1 to flush the lines until clear, and another 1-2 doing the stopping abs cycles
     
  6. Erickk120

    Erickk120 Member

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    I freaking love you! That was it. I didn't see one under the master cylinder yesterday but it never occurred to me it was relocated there in my truck either. I will bleed all 4 corners on Sunday just to make sure there is no air. Thank you all for the quick responses.
     

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